Analysis of surveillance results of Aedes albopictus as dengue vector in Nanchang City,Jiangxi Province,China,2018-2023
Objective To investigate the seasonal fluctuation patterns of the density of Aedes albopictus larvae and adults,vectors of dengue fever,in Nanchang City,providing a scientific basis for effective prevention and control of dengue fever. Methods The Breteau Index (BI) method and double-layer trapping method were used to monitor the density of Ae. albopictus larvae and adults,respectively. The monitoring results were summarized and analyzed. SPSS 26.0 software was used for statistical analysis. Differences in BI at different time points were analyzed by the Chi-square test,and differences in net trap index or BI across different times and habitats by analysis of variance or the Kruskal-Wallis test,and the risk of dengue fever transmission was assessed. Results The average BI in Nanchang City between 2018 and 2023 was 4.08,which showed a downward trend year by year (x2=189.809,P<0.001),with the highest in 2019 and the lowest in 2022. The average Attraction-Collection Index was 1.17 mosquitoes/(trap·hour). Both the BI and trapping index of the whole city showed significant seasonal fluctuations,each displaying a single peak,with the peak values occurring in July at 5.63 and 1.83 mosquitoes/(trap·hour),respectively,and the lowest in October at 2.28 and 0.51 mosquitoes/(trap·hour),respectively. The BI and trapping index of urban areas were both higher than those of parks,construction sites,and hospitals. In different habitats,the trend of changes in BI in different months showed an unimodal curve,with the peak appearing from June to August,while the BI trends varied across different years. From 2018 to 2023,there was a dengue transmission risk in 30.56％ (11/36) of monitored months,and the BI value in June 2018 reached the threshold for dengue fever outbreak risk. Conclusion The annual fluctuation trend of the density of Aedes mosquitoes as vectors in Nanchang City shows a decreasing trend,but there is still a risk of local transmission of dengue fever. To prevent dengue outbreaks caused by imported pathogens,it is necessary to strengthen comprehensive management of breeding grounds in the external environment,enhance monitoring of vector Ae. Albopictus,and take effective control measures in time.
Dengue feverAedes albopictusmonitoringBreteau Indexnet trap index
万方数据
维普
